Trachyte
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Trachyte is an extrusive igneous rock composed mostly of alkali feldspar. It is usually light-colored and aphanitic, with minor amounts of mafic minerals, and is formed by the rapid cooling of lava en
A cut sample of trachyte, with phenocrysts of sanidine, in a wall in Germany
Polished opal on trachyte
The Breadknife is a peralkaline trachyte dike in the Warrumbungles of eastern Australia.
Iron Pot is one of several trachyte plugs in the Hedlow Creek region west of Yeppoon in Central Queensland.
Dimension stone
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Dimension stone is natural stone or rock that has been selected and finished to specific sizes or shapes. Color, texture and pattern, and surface finish of the stone are also normal requirements. Anot
Trachyte
…back-arc extension. Trachyte has also been found in Gale crater on Mars. Trachyte has been used as decorative building stone and was extensively used as dimension stone in the Roman Empire and the Republic of Venice. Trachyte has a silica content of 60 to 65% and an alkali oxide content of over 7%. This gives it less…
Large blocks of granite dimension stone being loaded at Teignmouth in Devon, southern England, in 1827
Surface of a marble slab from Sinj, Croatia
Rough-cut slabs of granite dimension stone
Slate tile covers this entire structure in Germany